25579817 has 2 divisors, whose sum is σ = 25579818. Its totient is φ = 25579816.

The previous prime is 25579789. The next prime is 25579819. The reversal of 25579817 is 71897552.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19324816 + 6255001 = 4396^2 + 2501^2 .

It is a cyclic number.

It is not a de Polignac number, because 25579817 - 2¹² = 25575721 is a prime.

Together with 25579819, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (25579819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12789908 + 12789909.

It is an arithmetic number, because the mean of its divisors is an integer number (12789909).

Almost surely, 2^25579817 is an apocalyptic number.

It is an amenable number.

25579817 is a deficient number, since it is larger than the sum of its proper divisors (1).

25579817 is an equidigital number, since it uses as much as digits as its factorization.

25579817 is an evil number, because the sum of its binary digits is even.

The product of its digits is 176400, while the sum is 44.

The square root of 25579817 is about 5057.6493551847. The cubic root of 25579817 is about 294.6450466030.

The spelling of 25579817 in words is "twenty-five million, five hundred seventy-nine thousand, eight hundred seventeen".